/*
 * Copyright 2008 Nokia Siemens Networks Oyj
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.robotframework.javalib.keyword;

/**
 * A keyword that checks the amount of arguments provided by Robot before
 * operating.
 */
public abstract class ArgumentCheckingKeyword extends PreparableKeyword implements ExpectedArgumentCountAware {
    protected void prepare(Object[] arguments) {
        checkArgumentCount(arguments);
    }

    private void checkArgumentCount(Object[] arguments) {
        int expectedArgumentCount = getExpectedArgumentCount();
        if (arguments.length != expectedArgumentCount) {
            throw new IllegalArgumentException("Illegal number of arguments (should be " +
                    expectedArgumentCount + ", but got " + arguments.length + ")");
        }
    }
}
